Various:
- Softkickers (I don't wanna talk about all here);
Or just put it over 3.0 machine, but be warned: is no good do this. If you have a devalidation issue, the Amiga will be not able to repair the RDB (FFS user only).
Same problem with updated FFS versions or patchs.
If you use SFS, PFS (1,2 or 3) or other file system, go ahead.